Alright La7200 again... on the Blackmagic 2.5k

Matthew Marshall · 2014-11-06T14:59:42+0000

Trying to understand / fix the LA7200 to make it clearer, less CA, sharper and more usable. Building a lens from other lenses to attempt to do this. In any case, im trying to understand what is causing the issues in general using the LA7200 on DSLR or Blackmagic cinema camera. Is it because of the sensor cropping then? The LA7200 was designed for a 4:3 sensor crop therefore it will not work correctly on the BMCC, or larger sensors? Or is it simply a design flaw overall of the LA7200 , poor lens design / poor coating If it is a crop sensor issue, what is happening on the LA7200 to cause issues because the sensors are larger crop. Is the back lens element simply too small, where the image is being projected against the taking lens too small therefore when desqueezed you see parts of the image you really should not? i.e. the taking lens and the sensor is capturing too much of the la7200? By adding a diopter behind it does that then, make it larger i.e. projects less of what is seen from the front of the la7200 to the sensor? Or is it more complex than this. I have tried using a diopter behind the LA7200 i think its a Tokina 0.5 Not sure. I mean it says No 0.05 so I dont know at this point. In any case it does not seem to help. Just trying to understand, thanks anyone that can help.

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